Wood-pulp separator



2 Sheets-Sheet 1. E. F. MILLARD. WOOD PULP SEPARATOR.

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(No Model.) 2 Sheets-Sheet 2. B. P. MILLARD. WOOD PULP SEPARATOR.

No. 522,997. Patented JuIy 17, 1894.

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UNITED STATES PATENT OFFICE.

EDWARD F. MILLARD, OF JACKSON, MICHIGAN.

WOOD-PU LP SEPARATOR.

SPECIFICATION forming part of Letters Patent No. 522,997, dated July 17,1894.

Application filed July 18, 1893- Serial No. 480,813. (No model.)

To all whom it may concern:

l 3e it known that I, EDWARD F. MILLARD, a citizen of the United States,residing at J ackson, county of Jackson, State of Michigan, haveinvented a certain new and useful Improvement in Wood-Pulp Separators;and I declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit pertalus to make and use the same, reference belng had to theaccompanying drawings, which form a part of this specification.

The machine herein described is an improvement upon one patented by meAugust 4, 1891, No. 457,089, and the invention herein described consistsin certain modifications in the details thereof, but operating upon thesame general system.

In the drawings, Figure 1 is a horizontal section of the machine withoutthe worm. Flg. 2 is a partial vertical sectional View, showmg the worm.Fig. 3 is a section of the discharge end of the screen and a dipperattached thereto. Fig. 4 is a sectional view of the separating screenand the trough or casing in which it runs. Fig. 5 is a similar view ofthe washing machine.

In the drawings, the same letters represent the same parts.

A is a cylinder, covered preferably with perforated sheet metal, andhung upon hollow trunnions B and B journaled on the ends of the vat G.

D is an inlet pipe through which the pulp liquor is introduced into thehollow trunnion B, and from thence into the interior of the screen, Thescreen is revolved by any suitable or convenient means.

E is an axle suspended at either end by means of a spider to the headsof the screen, the spiders being shown at e and e. The spider at e hasonly one opening into which the dipper enters that is hereinafterdescribed. To this axle is attached, by means of suitable spokes, a wormF, preferably of angle iron, one flange of the angle iron ex tendingradially from the inner surface of the screen, and the other flangeextending from the outer edge of the first described, forming the outersurface of the worm. This surface is preferably placed at about one inchfrom the periphery of the screen and is concentric with it. At F it isformed in the shape ofa cycloid, and brought to the opening in thespider e, and forms a dipper at the discharge end of the screen, asshown in Fig. 2, by means of which material is brought up and carriedout of the screen A into the hollow trunnion B. The revolution is insuch direction that the perpendicular flange of the worm compelsinclosed material to travel from the head to the tail of the machine.The horizontal flange of the worm picks up the heavier and coarserparticles and slivers and engages them in its angle, from whence theyare carried forward by the successive revolutions as they continuallydrop to the lowest point, until they are ultimately carried out by thedipper through the hollow trunnion B. The fine material is gently workedthrough the perforations in the screen into a trough or concave A andwhich is located an inch or so from, but concentric with, the screen A.f

A ledge or dam is formed upon the interior of the casing at A whichholds the water and pulp at the level of its upper edge, but which takesthe fine material from oi the surface and carries it over into anymaterial passage way for disposing of it, the operation of this dambeing substantially the same as those shown in Patent No. 457,089,hereinbefore mentioned, one only, however, being employed, instead oftwo'as shown therein. As there will be some fine pulp remaining,adboring to the surfaces of the slivers, and also being held insuspension in the water accompanying the slivers, the overflow throughthe trunnion B is subjected to a second treatment or washing operationin another screen, which I have shown directly attached to the trunnionB. This screen, marked I, has perforations in its periphery, preferablysmaller than in the screen A. It has formed upon its interior surface aseries of flanges of the section of a screw, J, J, J, and so disposedthat, as the screen rotates these flanges are carried down into the pulpheld upon its interior, and it forces the same along toward the tail ofthe machine, where there is a second dipper taking off the coarsematerial and depositing it out through an axial opening of IOC lessdiameter than the diameter of the screen at K. This screen also revolvesin a vat or trough, marked L, and the surplus of. water with the finematerial is carried over-1a dam M, substantially in the same manner asthe operation described in my Patent No. 457,089. A washing device isprovided substantially as therein described.

It will be observed that the essential features of difierence betweenthe device herein described and my former patent, are that the worm hasa different cross section; that it is supported upon a central axle,leaving a free, clear space between it and the screen, and that but oneworm is employed. It has been found in practice that the described formis more efficient in separating slivers and coarse particles from thepulp than the form shown in my previous patent, although they bothoperate upon the same general principle of avoiding any violent forcetending to drive the coarser particles through the meshes of the screen.

In this device, the chief elementof its ef ficiency resides inv theconcave nature as shown by cross section of the internal worm, theconcavity being directed toward the tail and axis of the machine. Thisconcavity scoops up and carries along with it, as hereinbefore stated,the coarser particles. It is obvious, therefore, that it is notnecessary to make it exactly in the form of an angle, or

of angle iron, but that a half of atub'e, prop-' erly disposed, wouldanswer the purpose.

What I claim is 1. The combination of a rotary screen carried upontubular journals, one of which is an inlet opening therein, and theother isaconcentric discharge opening therefrom, a conveyer located in,and rotating with, but detached from the periphery of the screen, saidconveyer being constructed with two flanged edges, one of which issubstantially radial to the axis of the screen, and the othersubstantially parallel and concentric to the periphery.

of the screen, theend of the conveyer adjacent to the discharge openingbeing of cycloidal form and forming an elevating dipper adapted todischarge in said opening, substantially as described.

2. In combination with a rotary screen carried upon tubular journals,one of which constitutes an inlet into said screen, and the otherconstituting a concentric discharge opening therefrom, a conveyerlocated in said screen and rotating simultaneously therewith, butdetached from the periphery of the screen, said conveyer having twoflanged edges, one substantially parallel to and concentric with theperiphery of the screen, and the other substantially radial to the axisof the screen, the

end adjacent to the discharge opening being cycloidal in form andconstituting an elevating dipper, a tank in which said screen ispartially submerged, and an exterior receptacle for the overflow,substantially as described.

3. In combination with a rotary screen carried upon tubular journalswhich respectively constitute inlet and outlet openings therein andtherefrom, a conveyer located in and rotating with said screen, butdetached from its periphery, said conveyer having two flanged edges, onesubstantially radial to the axis of the screen, and the othersubstantially parallel and concentric to its periphery, an elevatingdipper adjacent tothe discharge opening, a tank in'which said screenispartially submerged, an exterior receptacle for the overflow, a secondscreen into which the tailings are deposited, said second screen havingtubular journals respectively constituting an inlet and a dischargeopening, and means for further washing the tailin gs, substantially asdescribed.

4. In combination with a rotary screen carried upon tubular journalsconstituting inlet and outlet openings therein and. therefrom, aconveyer located in and rotating with said screen, but detached from itsperiphery, said conveyer having two flanged edges, one substantiallyradial to the axis of the screen, and the other substantiallyparalleland concentric to its periphery, an elevating dipper adjacent to thedischarge opening, a tank in which said screen is partially submerged,an exterior receptacle for the overflow, a second screen into which thetailings are deposited, said second screen having tubular journalsrespectively constituting an inlet and a discharge opening, meanslocated therein for conveying the tailings to the discharge end of saidsecond screen, and a dipper located at said discharge end and rotatingwith the said screen, substantially as described.

In testimony whereof I sign this specification in the presence of twowitnesses.

EDWARD F. MILLARD.

Witnesses: I

W. J WILLrrs, E. H. HENDERSON.

ICC

